Under normal weather and sea conditions when...

Question 1 / 2707066636ee728f7522a1c518406

Question 1 of 2707066636ee728f7522a1c518406

Under normal weather and sea conditions when securing a stack of containers with twist locks, lashings are required when the tier exceeds what height?

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Question 1 of 27070

Under normal weather and sea conditions when securing a stack of containers with twist locks, lashings are required when the tier exceeds what height?

🔍 Key Concepts

• Twist locks vs. lashings – what each does in securing container stacks • How stack height affects stability and racking forces on containers • Standard practice for when additional securing (lashings) supplements twist locks under normal conditions

💭 Think About

• Think about why twist locks alone might be acceptable up to a certain tier, but not beyond it. • Consider how the forces on the bottom containers increase as you add more tiers on top. • Ask yourself: At what stack height do most container-securing manuals introduce lashing rods or wires in addition to twist locks?

✅ Before You Answer

• Verify how many tiers can normally be secured with twist locks only in good weather and sea conditions. • Check when standard lashing plans say "additional lashings required above this tier". • Make sure you distinguish normal conditions from heavy weather or special cargo where lashings might be used earlier.

Question 1 of 27070

Under normal weather and sea conditions when securing a stack of containers with twist locks, lashings are required when the tier exceeds what height?

One container

Three containers

Lashings are always required

Two containers